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Abstract

Current designs of combined VIS-color/SWIR camera optics use constant F-number over the full field of view (FOV)
range. Especially in the SWIR, limited space for the camera integration in existing system volumes and relatively high
pitch dimensions of 15μm or even 20μm force the use of relatively high F- numbers to accomplish narrow fields of view
less than 2.0° with reasonable resolution for long range observation and targeting applications. Constant F-number
designs are already reported and considered [1] for submarine applications. The comparison of electro-optical
performance was based on the given detector noise performance and sensitivity data by the detector manufacturer [1] and
further modelling of the imaging chain within linear MTF system theory.
The visible channel provides limited twilight capability at F/2.6 but in the SWIR the twilight capability is degraded due
to the relatively high F-number of F/7 or F/5.25 for 20 μm and 15 μm pitch, respectively. Differences between prediction
and experimental verification of sensitivity in terms of noise equivalent irradiance (NEI) and scenery based limiting
illumination levels are shown for the visible and the SWIR spectral range. Within this context, currently developed
improvements using optical zoom designs for the multispectral SWIR/VIS camera optics with continuously variable Fnumber
are discussed, offering increased low light level capabilities at wide and medium fields of view while still
enabling a NFOV < 2° with superior long range targeting capabilities under limited atmospherical sight conditions at
daytime.

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Journal of Applied Remote SensingJournal of Astronomical Telescopes Instruments and SystemsJournal of Biomedical OpticsJournal of Electronic ImagingJournal of Medical ImagingJournal of Micro/Nanolithography, MEMS, and MOEMSJournal of NanophotonicsJournal of Photonics for EnergyNeurophotonicsOptical EngineeringSPIE Reviews